#ifndef GETTIMEOFDAY_H
#define GETTIMEOFDAY_H
#pragma once

#include <time.h>
#if defined(_MSC_VER) || defined(_MSC_EXTENSIONS)
#define DELTA_EPOCH_IN_MICROSECS 11644473600000000Ui64
#else
#define DELTA_EPOCH_IN_MICROSECS 11644473600000000ULL
#endif

struct timezone {
  int tz_minuteswest; /* minutes W of Greenwich */
  int tz_dsttime;     /* type of dst correction */
};

struct timeval {
  long tv_sec;
  long tv_usec;
};

__forceinline int gettimeofday(struct timeval *tv, struct timezone *tz) {
  FILETIME ft;
  unsigned __int64 tmpres = 0;
  static int tzflag;

  if (NULL != tv) {
    GetSystemTimeAsFileTime(&ft);

    tmpres |= ft.dwHighDateTime;
    tmpres <<= 32;
    tmpres |= ft.dwLowDateTime;

    /*converting file time to unix epoch*/
    tmpres -= DELTA_EPOCH_IN_MICROSECS;
    tmpres /= 10; /*convert into microseconds*/
    tv->tv_sec = (long)(tmpres / 1000000UL);
    tv->tv_usec = (long)(tmpres % 1000000UL);
  }

  if (NULL != tz) {
    if (!tzflag) {
      _tzset();
      tzflag++;
    }

    long val;
    int dl;
    _get_timezone(&val);
    _get_daylight(&dl);

    tz->tz_minuteswest = val / 60;
    tz->tz_dsttime = dl;
  }

  return 0;
}
#endif